package 字节;
class ListNode {
    int val;
    ListNode next;
    ListNode() {}
    ListNode(int val) { this.val = val; }
    ListNode(int val, ListNode next) { this.val = val; this.next = next; }
}
public class 翻转链表 {
    public ListNode ReverseList(ListNode head) {
        if(head==null||head.next==null){
            return head;
        }
        ListNode last=ReverseList(head.next);
        head.next.next=head;
        head.next=null;
        return last;
    }




}
